@Plevs Yes, I get that, too, because getting rid of it is basically what Anti-Aliasing does. It's smoothing out the edges of objects. To achieve this there are different methods which game engines are offering. Other games for example offer FSAA or MSAA, today TAA is very popular. For me the problem is: I don't like FSAA because it looks like someone is smearing butter over the screen and I don't like TAA because it causes ghosting effects when there's movement. F1 sadly isn't offering MSAA, and also it doesn't offer FSAA.
The blurryness probably comes from the ghosting effects of TAA. When you are in VR you are constantly moving whether you like it or not. Neither ones head is static :D So the picture distorts due to ghosting.
CAS is your FX Sharpening. CAS stands for "Contrast Adaptive Sharpening" and the one offered by the game is AMD FidelityFX. Try setting TAA to "false" but leave CAS to "1". Maybe that helps you. I personally do not care about having no Anti-Aliasing :D